NSIDC-0064_1

Nenana Ice Classic: Tanana River Ice Annual Breakup Dates, Version 1

Version 1 eng; usa
  • Abstract
    The Tanana river in the Interior of Alaska usually freezes over during October and November. The ice continues to grow throughout the winter accumulating an average maximum thickness of about 110 cm, depending upon winter weather conditions. The Nenana Ice Classic competition began in 1917 when railroad engineers bet a total of 800 dollars, winner takes all, guessing the exact time (month, day, hour, minute) ice on the Tanana River would break up. Each year since then, Alaska residents have guessed at the timing of the river breakup. A tripod, connected to an on-shore clock with a string, is planted in two feet of river ice during river freeze-up in October or November. The following spring, the clock automatically stops when the tripod moves as the ice breaks up. The time on the clock is used as the river ice breakup time. Many factors influence the river ice breakup, such as air temperature, ice thickness, snow cover, wind, water temperature, and depth of water below the ice. Generally, the Tanana river ice breaks up in late April or early May (historically, April 20 to May 20). The time series of Tanana river ice breakup dates can be used to indicate climate change in the region.
  • Purpose
    Scientific Research

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    Processing Level

    Level 2

    Quality
    Collection Progress

    Planned

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    Science Keywords
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Freeze/Thaw
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Freeze/Thaw
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Ice Growth/Melt
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Ice Growth/Melt
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • River Ice
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • River Ice

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Platforms
  • In Situ Land-based Platforms
    GROUND STATIONS
    Instruments
    • CLOCKS

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
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  • National Snow and Ice Data Center
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    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • National Snow and Ice Data Center
    DISTRIBUTOR

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

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    Nenana Classic

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  • NSIDC
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    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • NSIDC
    Data Center Contact
    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Collection Citations Fields:

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    Collection Citations
    • Nenana Ice Classic: Tanana River Ice Annual Breakup Dates, Version 1
      1

      Published by: National Snow and Ice Data Center